package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private CategoryMapper categoryMapper;

    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //向菜品表插入数据
        dishMapper.insert(dish);

        Long dishId = dish.getId();

        //插入n条菜品口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));

            dishFlavorMapper.insertBatch(flavors);

        }

    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper .startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }


    @Transactional
    public void delete(List<Long> ids) {
        //起售中的菜品不能删除
        for (Long id : ids) {
            Dish dish=dishMapper.getById(id);
            if(dish.getStatus() == 1){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //被套餐关联的菜品不能删除
        for (Long id : ids) {

            List<Long> setmealIdsByDishIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
            if(setmealIdsByDishIds != null && setmealIdsByDishIds.size() > 0){
                //当前菜品被套餐关联，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL );
            }


        }

        for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品后，关联的口味数据也要删除
            dishFlavorMapper.deleteByDishId(id);

        }


    }


    public DishVO getByIdWithFlavor(Long id) {

        //根据id查菜品数据
        Dish dish = dishMapper.getById(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);


        //根据菜品id查菜品口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);

        Long dishId = dish.getId();
        dishFlavorMapper.deleteByDishId(dishId);
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    @Override
    public void startOrStop(Integer status, Long id) {

        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
                dishMapper.update(dish);
    }

    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish= Dish.builder()
                .categoryId(categoryId)
                .status(1) //只查询起售的菜品
                .build();

        return dishMapper.list(dish);
    }



    //
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
